Parameters related to the visual performance achieved with high and low addition trifocal intraocular lenses

Session Details

Session Title: Multifocal IOLs

Session Date/Time: Sunday 23/09/2018 | 16:30-18:00

Paper Time: 17:33

Venue: Room A3, Podium 1

First Author: : J.Fernández SPAIN

Co Author(s): :    M. Rodriguez-Vallejo   A. Tauste   J. Martinez   D. Pinero           

Abstract Details

Purpose:

To evaluate the parameters related to the visual performance achieved with low and high addition trifocal intraocular lens (IOLs) and to propose a model for the prediction of the visual acuity defocus curve at the near range.

Setting:

Qvision, Ophthalmology Department Vithas Virgen del Mar Hospital, Almería, Spain.

Methods:

26 subjects implanted with a high addition (HA) and 34 with a low addition (LA) trifocal IOLs were retrieved for the analysis. Preoperative measured variables included mean corneal power (Km), corneal regular astigmatism (RA), anterior chamber depth (ACD), axial length (AXL), total irregular astigmatism (IA), spherical aberration (SA) and distance from pupil center to vertex normal (µ). Same variables were retrieved from the three month visit follow-up in addition to the actual lens position (ALP), the calculated effective addition (EA), the IOL centration from vertex normal (d), and the visual acuity defocus curve.

Results:

Km was related with the near area under the defocus curve (from -2.00 D to -4.00 D) with both IOLs rho = -0.38 (p= 0.03) for the LA and r = -0.39 (p = 0.05) for the HA. The near area was also correlated with d, r =0.44 (p=0.009) and IA r = -0.41 (p = 0.02) for the LA lens. These three variables explained the 34% of the near area under the curve variation by the multiple linear regression analysis. On the other hand, the near area under the curve in HA lens was tolerant to d and IA.

Conclusions:

Eyes with less corneal power have higher near area under the defocus curve. Previous theoretical studies have recommended low addition multifocal lenses for hyperopes arguing that a lower ALP results in higher addition. However, our clinical results are not in agreement with this hypothesis and this can be explained because, in the balance of Km and ALP, Km has higher importance than ALP and even though addition increases with decreasing ALP, at the same time Km increases, which result in less performance of hyperopes at near. Furthermore, LA lens is more sensitive to lose near vision by eye parameters.

Financial Disclosure:

... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, ... travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, ... research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented